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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9881e3d3306bf9e00680163e399e4d6a294b74ebbb3c8abfa2285228c60bb3a' 
  AND token = '409XfckqhhPUD7ac1iq5YN70DMBo+VhElhzEITXC7UQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}